From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Fri, 20 Nov 2020 08:46:26 -0500
Message-ID: <CAP-UEKvi60tpOjtpjxPyeR_TxaFe9-T6Gevgu8+Ts76Ypf6RKA@mail.gmail.com>
Subject: Re: [FlyRotary] Cooling Mods to Glasair
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Ah that's so great to hear that you are at that testing phase.
I too believe the wedge shape isn't all it's supposed to be.
What reshape did you end up with ?

- Matt Boiteau


On Fri, Nov 20, 2020 at 5:28 AM Stephen Izett stephen.izett@gmail.com <
flyrotary@lancaironline.net> wrote:

> Hi Guys
>
> I thought I should provide  an update.
>
> Having installed 5 differential pressure transducers and interfaced them
> via spare Dynon EGT inputs, Ive been collecting some H2O diffuser pressur=
e
> data.
>
> First tests took pressure readings at 5 points (4 taps, 4 inches in from
> the four corners and one in the middle) referenced to the ships Static
> system.
> Today I changed those taps to reference the pressure directly across the
> core at these same locations.
>
> This has revealed the importance of measuring the pressure across the
> radiator as the pressures behind the radiator is not at all equal.
>
> The data has revealed that our wedge diffuser was not equally distributin=
g
> the air pressure across the radiator face very well at all.
> Far more air was going through the back area as others have reported in
> the past.
>
> So we will reshape the diffuser wall, making it harder for the air to get
> to the back and retest.
>
> We have also increased the Oil inlet area from ~9in2 to ~ 14in2 and this
> has improved the oil temps.
> On a flight today OAT of 79F on climb out Oil and H2O temps peaked at 210=
F.
>
> I=E2=80=99m very happy with the changes and expect to get further improve=
ments,
> and will shortly turn our attension to mechanising the cowl flaps to get
> temps up and cooling drag down in the cooler air.
>
> Cheers
>
> Steve Izett
> Glasair Super IIRG Renesis 4 port RD1C, EC2, EM3
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div dir=3D"ltr">Ah that&#39;s so great to hear that you are at that testin=
g phase.<br>I too believe=C2=A0the wedge shape isn&#39;t all it&#39;s suppo=
sed to be.<br>What=C2=A0reshape did you end up with ?<br><br clear=3D"all">=
<div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_sig=
nature"><div dir=3D"ltr"><div><div dir=3D"ltr">- Matt Boiteau</div></div></=
div></div></div><br></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" c=
lass=3D"gmail_attr">On Fri, Nov 20, 2020 at 5:28 AM Stephen Izett <a href=
=3D"mailto:stephen.izett@gmail.com">stephen.izett@gmail.com</a> &lt;<a href=
=3D"mailto:flyrotary@lancaironline.net">flyrotary@lancaironline.net</a>&gt;=
 wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Guys<=
br>
<br>
I thought I should provide=C2=A0 an update.<br>
<br>
Having installed 5 differential pressure transducers and interfaced them vi=
a spare Dynon EGT inputs, Ive been collecting some H2O diffuser pressure da=
ta.<br>
<br>
First tests took pressure readings at 5 points (4 taps, 4 inches in from th=
e four corners and one in the middle) referenced to the ships Static system=
.<br>
Today I changed those taps to reference the pressure directly across the co=
re at these same locations.<br>
<br>
This has revealed the importance of measuring the pressure across the radia=
tor as the pressures behind the radiator is not at all equal.<br>
<br>
The data has revealed that our wedge diffuser was not equally distributing =
the air pressure across the radiator face very well at all.<br>
Far more air was going through the back area as others have reported in the=
 past.<br>
<br>
So we will reshape the diffuser wall, making it harder for the air to get t=
o the back and retest.<br>
<br>
We have also increased the Oil inlet area from ~9in2 to ~ 14in2 and this ha=
s improved the oil temps.<br>
On a flight today OAT of 79F on climb out Oil and H2O temps peaked at 210F.=
<br>
<br>
I=E2=80=99m very happy with the changes and expect to get further improveme=
nts, and will shortly turn our attension to mechanising the cowl flaps to g=
et temps up and cooling drag down in the cooler air.<br>
<br>
Cheers<br>
<br>
Steve Izett<br>
Glasair Super IIRG Renesis 4 port RD1C, EC2, EM3<br>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer" ta=
rget=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer" target=3D"_blank">http://mail=
.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div>

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